For the past three days my mouse has been sleeping a lot, even during the night. She eats but not as much and I haven't seen her get a drink. Up until this morning she was living alone (I thought she was a male) so I thought she was depressed. I got another female to keep her company but she's still sleeping a lot. Does it take a while for a mouse to get out of their funk or is there something more going on?

Update: the new mouse Poppy is getting a long really well with my old mouse who I renamed Lily. I even found them snuggled together underneath their bedding. However Lily is still sleeping a lot and to my knowledge has not been drinking. She is also really hunched over when she walks around or runs on the wheel. I am taking her to the vet tomorrow. I'd take her today but the vet is not in and he's literally the only small animal vet in my area.